Last October, the world’s stock of negative-yielding debt had tumbled by more than half from its record high as investors adjusted to the end of super-loose monetary policy. Now it’s soaring again after the dovish pivots around the world. The Bloomberg Barclays Global Aggregate Negative-Yielding Debt Index has increased in value by well over $3 trillion since its low five months back, to $9.3 trillion Wednesday. That’s still below the all-time record of $12.2 trillion in June 2016. As warnings over the global growth outlook abound, bond yields have been in retreat. One risk-free benchmark -- 10-year Treasury yields ... (full story)